Bird

From Rap Dictionary

noun

bird

1. Kilo. Specifically, cocaine. "A bird in the hand" -- Ice Cube (A bird in the hand [1991]).
2. English slang for 'girl'. "Around here we say 'birds', not bitches" -- The Streets (Let's Push Things Forward) [1]
3. A gun. (Desert Eagle, Hawk, etc)
4. A jail sentence
5. The middle finger, especially when saying "flipping the bird."
6. Bird can also mean a bullet "when mel-man got his time he shot birds at the judge" -- young jeezy(Soul survivor)
7. To have a full bird - to have a full bath

how can it mean all those diffrent things? Because it's used in different contexts, making the meaning easy to figure out.